These are octopus eggs.

These are octopus eggs.  Did you know that female octopuses produce only one set of eggs in their lives? After they lay the eggs, they take care of them alone, without even going out to get any food? They reserve their energy and as soon as all the pulpits are born, they die. So if you discover any octopus eggs like the ones on the photo, please do not disturb them! 1